题目内容
阅读理解
We know that there is air around the earth. We will find there is less air or no air if we go far enough away from the earth. But when planes fly they need air to lift their wings （机翼）. But planes can't fly very high because the air gets thinner and thinner when they go higher and higher. Perhaps we can answer some of the questions now. What is the sky? Nothing, where is it? It is all around the earth. The sky is space （空间）. In this space there is nothing but the sun, the moon, the earth and all the stars.
根据短文内容，选择最恰当的答案。
1. The sky is ______.
[ ]
A. air B. the earth
C. the whole world D. space
2. There is ______ if we go far enough away from the earth.
[ ]
A. much air B. more and more air
C. less air or no air D. going to be air
3. Planes can't fly very high because ______.
[ ]
A. the air gets thinner and thinner
B. there is much air in the sky
C. they need air to lift their wings
D. planes are heavy
4. Where is the sky? ______.
[ ]
A. On the moon B. It is all around the earth
C. In planes D. In the sun
5. In the sky there is ______.
[ ]
A. air everywhere
B. the earth
C. nothing
D. the sun, the moon, the earth and all the stars
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